The purpose of this study is to determine in genotype 1 Hepatitis C Virus (HCV)-infected participants, the safety, tolerability, pharmacokinetics (how the drug is absorbed in the body, how it is distributed within the body and removed from the body over time) and antiviral activity of repeated doses of TMC649128 given as monotherapy and given in combination with pegylated interferon + ribavirin. We assess the pharmacokinetic/pharmacodynamic (how the study medication affects the body) (PK/PD) relationship for antiviral activity, active metabolite and safety of TMC649128 and its metabolites. We determine the short term safety and tolerability of the co-administration of TMC649128 and pegylated interferon + ribavirin during multiple dosing for 14 days in treatment-naive genotype 1 HCV-infected participants. We explore the effect of pegylated interferon + ribavirin on the pharmacokinetics of TMC649128 during the multiple dosing for 14 days in treatment-naive genotype 1 HCV-infected participants. We also assess in a preliminary way the short term antiviral effect of the combination of TMC649128 with pegylated interferon + ribavirin during a 14-day dosing period in treatment-naive genotype 1 HCV-infected participants.

A Phase Ib, Double-Blind, Randomized, Placebo-Controlled Trial in Genotype 1 HCV-Infected Subjects to Determine the Safety, Tolerability, Pharmacokinetics and Antiviral Activity of Repeated Doses of TMC649128 Given as Monotherapy and Given in Combination With Pegylated Interferon + Ribavirin

Change in the steady-state plasma concentrations of TMC649128. [ Time Frame: From baseline up to Day 80 per panel (panel 1 + panel 2 + panel 3). ]

Change in the steady-state plasma concentrations of TMC649128 following co-administration with pegylated interferon + ribavirin. [ Time Frame: From baseline up to day 84 (panel 4). ]

Viral load decreases and/or changes of viral load from baseline (HCV RNA copies/ml) (PK/PD). [ Time Frame: For monotherapy from baseline up to Day 80 per panel (panel 1 + panel 2 + panel 3) and for combination therapy from baseline up to day 84 (panel 4). ]

Number of participants with adverse events as a measure of safety and tolerability - TMC649128 as monotherapy and when co-administered with pegylated interferon + ribavirin. [ Time Frame: For monotherapy from baseline up to Day 80 per panel (panel 1 + panel 2 + panel 3) and for combination therapy from baseline up to day 84 (panel 4). ]

Secondary Outcome Measures:

Antiviral activity (HCV RNA levels) of TMC649128 as monotherapy and when co-administered with pegylated interferon + ribavirin. [ Time Frame: For monotherapy from baseline up to Day 80 per panel (panel 1 + panel 2 + panel 3) and for combination therapy from baseline up to day 84 (panel 4) ]

Antiviral activity (viral breakthrough) of TMC649128 as monotherapy and when co-administered with pegylated interferon + ribavirin. [ Time Frame: For monotherapy from baseline up to Day 80 per panel (panel 1 + panel 2 + panel 3) and for combination therapy from baseline up to day 84 (panel 4). ]

TMC649128 panel 3: 8 participants receive TMC649128. Actual dose and dose regimen (q12h or q24h) to be selected based on the results of the panels 1 and 2.

Drug: TMC649128

panel 3: 8 participants receive TMC649128. Actual dose and dose regimen (q12h or q24h) to be selected based on the results of the panels 1 and 2.

Placebo Comparator: 008

placebo. panel 3: 2 participants receive placebo. Actual dose and dose regimen (q12h or q24h) to be selected based on the results of the panels 1 and 2.

Drug: placebo.

panel 3: 2 participants receive placebo. Actual dose and dose regimen (q12h or q24h) to be selected based on the results of the panels 1 and 2.

Placebo Comparator: 009

placebo panel 4 arm 1: 10 participants receive PegIFN a-2a/RBV in combination with placebo administered q12h or q24h for 14 days. Actual dose and dose regimen (12h or 24h) is to be selected based on panels 1 2 and 3.

Drug: placebo

panel 4, arm 1: 10 participants receive PegIFN a-2a/RBV in combination with placebo, administered q12h or q24h, for 14 days. Actual dose and dose regimen (12h or 24h) is to be selected based on panels 1, 2 and 3.

Detailed Description:

TMC649128 is a nucleoside inhibitor (NI) of hepatitis C virus (HCV) polymerase in development for the treatment of chronic hepatitis C infection. Treatment-naive genotype 1 HCV-infected participants are participants who have never received (pegylated) interferon ([Peg]IFN), ribavirin (RBV) or any other approved or investigational treatment for chronic HCV infection. Treatment-experienced genotype 1 HCV-infected participants are defined as previous non-responder and relapse subjects to previous treatment regimens (IFN/RBV or PegIFN/RBV), who have never received a HCV polymerase inhibitor and HCV protease inhibitor treatment was stopped since at least one year. This study is a Phase Ib, double-blind, randomized, placebo-controlled trial in genotype 1 HCV-infected participants to determine the safety, tolerability, pharmacokinetics and antiviral activity of repeated doses of TMC649128 given as monotherapy and given in combination with pegylated interferon + ribavirin. This trial consists of 2 phases. In the first phase TMC649128 will be given as monotherapy during 10 days at different doses and dosing regimens. In the second phase TMC649128 will be administered at one selected dose regimen in combination with PegIFN a-2a/RBV for 14 days.; All dosages of TMC649128 or placebo are given orally under fed conditions.; The monotherapy phase includes 3 panels (panel 1-3) and the combination therapy phase includes 1 panel (panel 4). In panel 1, subjects are randomly assigned to receive TMC649128 at 1000 mg q24h (every 24h) (n=8) or placebo (n=2) q24h on Days 1-10. In panel 2 subjects are randomized into Arm 1 and Arm 2 and within each arm, subjects are randomly assigned to receive TMC649128 or placebo as follows: In arm 1 volunteers receive TMC649128 at a selected dose (n=8) or placebo (n=2) q12h on Days 1-10. In arm 2 volunteers receive TMC649128 at a selected dose (n=8) or placebo (n=2) q24h on Days 1-10. Panel 3: TMC649128 at a selected dose (n=8) or placebo (n=2) q12h (every 12h) OR q24h on Days 1-10 where the assignment is determined by randomization; Panel 4 volunteers are randomized into Arm 1 and Arm 2. In panel 4, arm 1, 10 volunteers receive placebo (q12h OR q24h, dosing regimen matched to Arm 2 of Panel 4) + PegIFN a-2a/RBV on Days 1-14. In Panel 4, arm 2, 10 volunteers receive TMC649128 at a selected dose (q12h OR q24h) + PegIFN a-2a/RBV on Days 1-14.; The actual dose of Panel 1 is derived from data obtained from the currently ongoing MC649128HPC1001 trial. The actual dose in Panel 2 will depend on the results of Panel 1 (total daily dose of TMC649128 administered in both arms of Panel 2 will be the same. The dose of TMC649128 of the q24h regimen in Arm 2 will be higher than the q24h dose administered in Panel 1 [1000 mg q24h]). The actual doses and dose regimens in Panels 3 and 4 will depend on the results of Panels 1 and 2 (data review meetings). Selection of doses and dose regimens in Panels 2, 3 and 4 will also depend on the data obtained from trial TMC649128HPC1001. Dosing will stay within the exposure limits. The intended doses for Panels 2 and 3 are 2000 mg or 3000 mg q12h or q24h, but may be adapted based on previous clinical data. If needed and based on the outcome of the Panel 1 results, subjects in Panel 3 may eventually receive a lower dose than in Panel 1. See detailed study description.

Treatment-naive volunteer, meaning never received (Peg)IFN, RBV or any other approved or investigational treatment for chronic HCV infection (Panels 1, 2, 3 or 4) OR volunteer is a documented prior non-responder or relapser subject to previous treatment regimens (IFN/RBV or pegylated IFN/RBV) but has stopped this treatment at least 6 months before screening

volunteer has never received a HCV polymerase inhibitor and HCV protease inhibitor treatment was stopped since at least one year (Panels 1, 2 or 3)

Historical liver biopsy graded as liver cirrhosis or evidence for the presence of oesophageal varices or a transient elastography (Fibroscan) result of more than 14.6 kPa within 2 years prior to screening

Evidence of decompensated liver disease defined as prior history or current evidence of ascites, hepatic encephalopathy, bleeding oesophageal or gastric varices

Evidence of any other cause of significant liver disease in addition to hepatitis C, this may include but is not limited to hepatitis B, drug- or alcohol-related cirrhosis, autoimmune hepatitis, hemochromatosis, Wilson's disease, non-alcoholic steatohepatitis, or primary biliary cirrhosis

Volunteer with diagnosed or suspected hepatocellular carcinoma

Volunteer receiving or having received any treatment for HCV during the 6 months before screening

Volunteer coinfected with Human Immunodeficiency Virus-1 (HIV-1) or HIV-2, or hepatitis A or B virus infection, or clinically active tuberculosis at study screening.

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01391117